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Schedule I - Condensed Financial Information of Registrant - CONDENSED BALANCE SHEETS, PARENT COMPANY (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Current Assets        
Cash and Cash Equivalents $ 230,373 $ 118,996    
Accounts Receivable from Subsidiaries 157,143 144,393    
Other 16,826 18,412    
Total Current Assets 570,170 452,752    
Investments in Subsidiaries 62,516 54,845    
Other Noncurrent Assets 51,377 41,177    
Total Assets 3,242,568 2,901,661    
Current Liabilities        
Accounts Payable to Subsidiaries 94,428 104,400    
Other 43,775 56,065    
Total Current Liabilities 309,757 237,636    
Other Noncurrent Liabilities 75,977 60,985    
Commitments and Contingencies (Note 13)    
Capitalization        
Long-Term Debt 824,059 823,821    
Total Shareholders' Equity 1,443,006 1,217,317 $ 990,777 $ 870,966
Total Capitalization 2,267,065 2,041,138    
Total Liabilities and Shareholders' Equity 3,242,568 2,901,661    
OTC        
Current Assets        
Cash and Cash Equivalents 228,137 119,246    
Other 977 1,045    
Total Current Assets 231,786 123,686    
Deferred Income Taxes 65,244 64,802    
Other Noncurrent Assets 50,795 43,779    
Total Assets 2,152,309 1,775,165    
Current Liabilities        
Other 15,320 15,994    
Total Current Liabilities 583,999 436,364    
Other Noncurrent Liabilities 45,455 41,686    
Commitments and Contingencies (Note 13)    
Capitalization        
Long-Term Debt 79,849 79,798    
Total Shareholders' Equity 1,443,006 1,217,317    
Total Capitalization 1,522,855 1,297,115    
Total Liabilities and Shareholders' Equity 2,152,309 1,775,165    
OTC | Subsidiaries        
Current Assets        
Accounts Receivable from Subsidiaries 2,555 3,278    
Interest Receivable from Subsidiaries 117 117    
Investments in Subsidiaries 1,725,584 1,463,998    
Notes Receivable from Subsidiaries 78,900 78,900    
Current Liabilities        
Accounts Payable to Subsidiaries 7 7    
Notes Payable to Subsidiaries $ 568,672 $ 420,363